Extended market hours data is available for U.S. markets from 4:00 AM to 8:00 PM ET with the Pro plan or higher. This data can be accessed via API at 1-minute, 5-minute, 15-minute, and 30-minute intervals or streamed through WebSocket.

The /time_series, /quote, /price, and /eod endpoints support pre- and post-market data by including the &prepost=true parameter in the request.